STRUCT MLXREG_CORE_HOTPLUG_PLATFORM_DATA(9)

💅 struct mlxreg_core_hotplug_platform_data(9) — the Kernel API Manual glow-up ✨

okay so bestie, welcome to the Kernel API Manual — yes that's the manual we're in, and today's main character is struct mlxreg_core_hotplug_platform_data, aka hotplug platform data 🫶. It's a struct, it holds platform data, and it's giving "I know where all the hotplug components live" energy. Let's get into it 💖

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✨ NAME ✨

struct mlxreg_core_hotplug_platform_data — hotplug platform data: literally that, no cap 💅

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🌸 SYNOPSIS 🌸

here's the whole struct, character for character, do not touch, we respect the source 🙏

struct mlxreg_core_hotplug_platform_data {
    struct mlxreg_core_item *items;
    int irq;
    void *regmap;
    int count;
    u32 cell;
    u32 mask;
    u32 cell_low;
    u32 mask_low;
    int deferred_nr;
    int shift_nr;
    void __iomem *addr;
    void *handle;
    int (*completion_notify)(void *handle, int id);
 };

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🎀 Members 🎀

every single one of them, in order, because we do not skip 🍓

• items — the same-type components that have the hotplug capability. like, the whole squad that can hotplug ✨
• irq — the platform interrupt number. it's the number 🔥
• regmap — the register map of the parent device, lowkey essential 💜
• count — how many components have the hotplug capability. the headcount, basically 🧚
• cell — where the top aggregation interrupt register lives 📍
• mask — the top aggregation interrupt common mask. masky masky 🌈
• cell_low — where the low aggregation interrupt register lives 📍 (but low)
• mask_low — the low aggregation interrupt common mask 💫
• deferred_nr — the I2C adapter number must exist prior to probing execution. it's giving "I need you to exist first", non-negotiable 🫶
• shift_nr — the I2C adapter numbers must be incremented by this value. math but make it kernel 🧮
• addr — the mapped resource address 🗺️
• handle — the handle that gets passed by the callback. yes, that handle 💅
• completion_notify — a callback to notify when platform driver probing is done 🎉 it's literally int (*completion_notify)(void *handle, int id), so it takes a void *handle and an int id, and it returns an int. icon behaviour 👑

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👀 SEE ALSO 👀

the whole friend group, no member left behind 💖

Kernel file ./include/linux/platform_data/mlxreg.h

• enum mlxreg_wdt_type(9)
• enum mlxreg_hotplug_kind(9)
• enum mlxreg_hotplug_device_action(9)
• struct mlxreg_core_hotplug_notifier(9)
• struct mlxreg_hotplug_device(9)
• struct mlxreg_core_data(9)
• struct mlxreg_core_item(9)
• struct mlxreg_core_platform_data(9)

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bestie reminder: the I2C adapter number in deferred_nr has to already exist before probing runs — this isn't a vibe suggestion, it's in the docs 🙈

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okay that's the whole page, you ate that 💅✨ — this masterpiece lives in ./include/linux/platform_data and it's dated October 2026, so yeah, ahead of its time fr fr 🦋👑💖